AP Chemistry Unit 8.2 pH and pOH of Strong Acids and Bases

Strong Acids

  • Strong acids dissociate completely → reaction will go to completion
  • [H+] = [HA] → molarity of H+ = molarity of the strong acid
  • Strong Acids to know: HI, HClO4 (Perchloric), HCl, HBr, H2SO4 (Sulfuric), HNO3 (nitric)
    • Any other acid is a weak acid and won’t dissociate completely
  • [OH-] is going to be small because of equilibrium
  • If [HA] < 10⁻⁷ → water is the dominant acid and donates most of the H+ → pH = 7!
    • Only for strong acids

Strong Bases

  • Strong Bases to know: Group 1 hydroxides, Ca(OH)2, Ba(OH)2, Sr(OH)2 → “CaBaSr”
  • Can tell that it is a base when given equation and it accepts H
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